body{
  margin: 0;
  padding: 0;

}
#box1{
  height: 100vh;
  width: 100%;
  background-image: url(1.jpg);
  background-size: cover;
  display: table;
  background-attachment: fixed;
}
#box2{
  height: 100vh;
  width: 100%;
  background-image: url(2.jpg);
  background-size: cover;
  display: table;
  background-attachment: fixed;
}
#box3{
  height: 100vh;
  width: 100%;
  background-image: url(3.jpg);
  background-size: cover;
  display: table;
  background-attachment: fixed;
}
#box4{
  height: 100vh;
  width: 100%;
  background-image: url(4.jpg);
  background-size: cover;
  display: table;
  background-attachment: fixed;
}
h1{
  font-family: Arial, Helvetica, sans-serif;
  font-size: 50px;
  color: white;
  margin: 0;
  text-align: center;
  display: table-cell;
  vertical-align: middle;
}